I have 2 plants and got one complete grow and then got to the end of flowering of the second (about 9 months after initial installation) and it started to STINK bad! Just swapped it out with my on hand spare. I've heard they last much longer than that, and I know the 4 inch jobs are smaller, but I had to use the 4 inch because of my setup. Should I just plan on swapping these out with each grow, or do we think I got a bad filter the first time around? I was hoping to get at least two out of each since my setup is so small, but happy to do what I've got to to keep under the radar and don't want to end up in the same situation again! Thanks!